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* Fix FLUX.1-Kontext LoRA support and dimension mismatch issues

- Added convert_keys_to_diffusers() for ComfyUI/PEFT format conversion
- Fixed dimension mismatch in LoRA weight concatenation
- Added preprocessing for single_blocks LoRA structure
- Added comprehensive test suite for Kontext LoRA
- Added example script for FLUX.1-Kontext with LoRA

Fixes #354

* lint

* FAL.AI and relight-kontext-lora patch